Unity 5.0.3f2 il2cpp problem: Attempting to call method 'System.Reflection.MonoProperty::GetterAdapt

I updated yesterday to 5.0.3 in the hopes this would fix all my code generation problems with 5.0.1. Thankfully it DID fix most of them, but this one still remains.

I believe the problem is occurring due to XML serialization of a pretty complicated object hierarchy including lists. The call stack is confusing, though, in that it mentions some methods that have NOTHING to do with that call stack. (references to Vuforia and LEMediatorVisualConsole)

I guess I'm going to try to replace one list which was being complained about in 5.0.1 with an array or a non-generic List and see what happens, I guess...

System.ExecutionEngineException: Attempting to call method 'System.Reflection.MonoProperty::GetterAdapterFrame' for which no ahead of time (AOT) code was generated.

Stack trace of the exception:
at System.Reflection.EventInfo+AddEventAdapter.Invoke (System.Object _this, System.Delegate dele) [0x00000] in <filename unknown>:0
at System.Reflection.MonoProperty+GetterAdapter.Invoke (System.Object _this) [0x00000] in <filename unknown>:0
at Vuforia.SurfaceBehaviour..ctor () [0x00000] in <filename unknown>:0
at System.Reflection.MonoProperty.GetValue (System.Object obj, System.Object[] index) [0x00000] in <filename unknown>:0
at Vuforia.SurfaceBehaviour..ctor () [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteListContent (System.Object container, System.Xml.Serialization.TypeData listType, System.Xml.Serialization.ListMap map, System.Object ob, System.Text.StringBuilder targetString) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteMemberElement (System.Xml.Serialization.XmlTypeMapElementInfo elem, System.Object memberValue) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteElementMembers (System.Xml.Serialization.ClassMap map, System.Object ob, Boolean isValueList) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteObjectElementElements (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteObjectElement (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob, System.String element, System.String namesp) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteObject (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob, System.String element, System.String namesp, Boolean isNullable, Boolean needType, Boolean writeWrappingElem) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteMemberElement (System.Xml.Serialization.XmlTypeMapElementInfo elem, System.Object memberValue) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteElementMembers (System.Xml.Serialization.ClassMap map, System.Object ob, Boolean isValueList) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteObjectElementElements (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteObjectElement (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob, System.String element, System.String namesp) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteObject (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob, System.String element, System.String namesp, Boolean isNullable, Boolean needType, Boolean writeWrappingElem) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteMemberElement (System.Xml.Serialization.XmlTypeMapElementInfo elem, System.Object memberValue) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteElementMembers (System.Xml.Serialization.ClassMap map, System.Object ob, Boolean isValueList) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteObjectElementElements (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteObjectElement (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob, System.String element, System.String namesp) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteObject (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob, System.String element, System.String namesp, Boolean isNullable, Boolean needType, Boolean writeWrappingElem) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializationWriterInterpreter.WriteRoot (System.Object ob) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializer.Serialize (System.Object o, System.Xml.Serialization.XmlSerializationWriter writer) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializer.Serialize (System.Xml.XmlWriter writer, System.Object o, System.Xml.Serialization.XmlSerializerNamespaces namespaces) [0x00000] in <filename unknown>:0
at System.Xml.Serialization.XmlSerializer.Serialize (System.Xml.XmlWriter xmlWriter, System.Object o) [0x00000] in <filename unknown>:0
at liveadz.liveadzenterprise.storage.impl.LEStorage.SerializeObject (System.Object pObject) [0x00000] in <filename unknown>:0
at LEMediatorVisualConsole.OnRemove () [0x00000] in <filename unknown>:0
at liveadz.liveadzenterprise.controller.LECommandStart.InitAppPrefs () [0x00000] in <filename unknown>:0

 

Ok, so I gather now that the problem I have is to do with just trying to serialize a property rather than anything to do with a list.

 

Can anyone throw light on what this problem means? I've been trying to remove elements from XML Serialization to isolate what the problem is, but my testing results don't make any sense.

 

I think something with AOT got broken recently. You could try switching to IL2CPP (which you need to do to submit to the App Store anyway).

 

Thanks for the response, ladron!

The above was with IL2CPP, actually.

I finally wisened up and made a test project just to test serialization. Class2 just has an int in it, Class1 has a list of Class2's.

This will serialize if I am using the 2.0 subset, whether with Mono or IL2CPP. If I have full 2.0 selected, though, it dies. Which is counter-intuitive to me...

And I think I'm currently using a plugin whose latest version requires 2.0.

 

@JoshPeterson This problem occurs with both Mono and IL2CPP.

 

I reviewed previous versions of my project and found that the reason this was all working before was that I was using the .Net 2.0 Subset. But one of the plugins I'm using now requires .Net 2.0.

I'm implementing a new super-simple list class with no (serialized) properties, to replace my use of List in xml-serialized classes.

Chris

 

I have a similar issue with .GetValue()

• Unity 4.6.6p3
• IL2CPP
• .NET 2.0
• Universal architecture

I can't fix this by switching to the subset because then I can't even build the project.

 

I believe it also happens with .NET 2.0 (but definitely not with the .NET 2.0 subset) when building with Mono backend.

 

Any news with this issue?

 

I have the opposite problem with WebGL. I have the error in .NET 2.0 but not in .NET 2.0 Subset, I'll file a bug.

 

Hi, I have the same issue as the threadstarter, I'm getting

ExecutionEngineException: Attempting to call method 'System.Reflection.MonoProperty::GetterAdapterFrame' for which no ahead of time (AOT) code was generated.

when runnning on IOS, with .NET 2.0 as Api compatibility level. Using Unity 5.2.1f1.

I'm forced to .Net 2.0 profile due to a plugin requiring it. I've tried using both IL2CPP and Mono as scripting backend but with the same result. Also tried different settings for strip enabling and level. When removing the plugin and reverting to .NET2.0 subset everything works. But unfortunately the plugin is needed.

In a previous post Josh stated:
The System.Reflection.MonoProperty+GetterAdapter type is not AOT friendly, for either Mono or IL2CPP. This works with the .NET 2.0 Subset profile because the version of mscorlib.dll with that profile takes a different code path which doe snot use the System.Reflection.MonoProperty+GetterAdapter type.

Does that mean that there is no fix or workaround for this issue?

 

I filed a bug (737529) the 19th but I still haven't received an answer.
Our project really depend of OnPropertyChanged so if it's not fixable, we will need to use a workaround.
Thanks!

 

Thanks! They reproduced the problem.

 

From my perspective bug (737529) is a major issue.

Currently Unity.Newtonsof.Json doesn't compile with .NET 2.0 Subset. At the same time, with .NET 2.0, you get the described execution engine exception when make an HttpWebRequest to an HTTPS URI.

Literally at the moment you can't have both Json.net and use https.

@JoshPeterson can this be prioritized for the next patch release?

 

@JoshPeterson Thanks! Looking forward to your updates.
It's a blocker and the sooner the better for us. Cheers!

 

Any updates on this bug?

 

I am sorry, but the problem isn't exactly fixed. A workaround is not a fix.
The current workaround only work for projects that don't rely on some libraries and methods, which aren't present in .NET 2.0 Subset.

Even tho most of those are easily replaceable, when you are using plugins and assets you have no knowledge of, or when you are an unskilled programmer, this becomes a huge obstacle you will hardly surpass.

And even if you do have the knowledge, you'll have to either substitute your plugin or rewrite it yourself. We can all imagine why this could be a huge pain.

The problem about treating this as a fix is the mindset it generates. If something is fixed, there's no reason to change it. But viewing it as a workaround means you know you'll have to fix it later.

 

Yes, pretty much. I am using 5.3.1f1 and the bug still occurs.
Before I found this topic I was running in 5.2.3.
I am installing 5.2.4f1 atm.

There is a thread abortion error in the middle of the report, which should be ignored, since it was already fixed.

Here is the Xcode report:

Code (CSharp):

1. Error: SendFailure (Attempting to call method 'System.Reflection.MonoProperty::GetterAdapterFrame' for which no ahead of time (AOT) code was generated.)
2.  
3.   at System.Net.FtpDataStream.System.IDisposable.Dispose () [0x00000] in <filename unknown>:0
4.   at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
5.   at System.Net.HttpWebRequest.GetResponse () [0x00000] in <filename unknown>:0
6.   at WebService.GetFile (System.String url, System.String& exceptionHolder) [0x00000] in <filename unknown>:0
7.   at WebService.DownloadPhoto (System.String url, System.String& errorHandler) [0x00000] in <filename unknown>:0
8.   at Student.DownloadPhoto () [0x00000] in <filename unknown>:0
9.   at SynchronizerInternal.WSDownloadThread`1[T].Process () [0x00000] in <filename unknown>:0
10.  
11. Attempting to call method 'System.Reflection.MonoProperty::GetterAdapterFrame' for which no ahead of time (AOT) code was generated.
12.  
13.   at System.Reflection.MonoProperty+GetterAdapter.Invoke (System.Object _this) [0x00000] in <filename unknown>:0
14.   at System.Reflection.MonoProperty.GetValue (System.Object obj, System.Object[] index) [0x00000] in <filename unknown>:0
15.   at System.Net.WebConnection.Write (System.Net.HttpWebRequest request, System.Byte[] buffer, Int32 offset, Int32 size, System.String& err_msg) [0x00000] in <filename unknown>:0
16.   at System.Net.WebConnectionStream.WriteHeaders () [0x00000] in <filename unknown>:0
17.   at System.Net.WebConnectionStream.SetHeaders (System.Byte[] buffer) [0x00000] in <filename unknown>:0
18.   at System.Net.HttpWebRequest.SendRequestHeaders (Boolean propagate_error) [0x00000] in <filename unknown>:0
19.   at System.Net.HttpWebRequest.SetWriteStream (System.Net.WebConnectionStream stream) [0x00000] in <filename unknown>:0
20. (Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 37)
21.  
22. NotSupportedException: /Users/builduser/buildslave/unity/build/Tools/il2cpp/il2cpp/libil2cpp/icalls/mscorlib/System.Threading/Thread.cpp(368) : Unsupported internal call for IL2CPP:Thread::Abort_internal - "Thread abortion is currently not implemented on IL2CPP; it is recommended to use safer mechanisms to terminate threads."
23.   at SynchronizerInternal.WSDownloadThread`1[T].Abort () [0x00000] in <filename unknown>:0
24.   at SynchronizerInternal.WSDownloader.Abort (System.String message) [0x00000] in <filename unknown>:0
25.   at SynchronizerInternal.WSDownloaderHandler.Update () [0x00000] in <filename unknown>:0
26. (Filename: currently not available on il2cpp Line: -1)
27.  
28. StudentThread download failed!
29. Error: SendFailure (Attempting to call method 'System.Reflection.MonoProperty::GetterAdapterFrame' for which no ahead of time (AOT) code was generated.)
30.  
31.   at System.Net.FtpDataStream.System.IDisposable.Dispose () [0x00000] in <filename unknown>:0
32.   at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
33.   at System.Net.HttpWebRequest.GetResponse () [0x00000] in <filename unknown>:0
34.   at WebService.GetFile (System.String url, System.String& exceptionHolder) [0x00000] in <filename unknown>:0
35.   at WebService.DownloadPhoto (System.String url, System.String& errorHandler) [0x00000] in <filename unknown>:0
36.   at Student.DownloadPhoto () [0x00000] in <filename unknown>:0
37.   at SynchronizerInternal.WSDownloadThread`1[T].Process () [0x00000] in <filename unknown>:0
38.  
39. Attempting to call method 'System.Reflection.MonoProperty::GetterAdapterFrame' for which no ahead of time (AOT) code was generated.
40.  
41.   at System.Reflection.MonoProperty+GetterAdapter.Invoke (System.Object _this) [0x00000] in <filename unknown>:0
42.   at System.Reflection.MonoProperty.GetValue (System.Object obj, System.Object[] index) [0x00000] in <filename unknown>:0
43.   at System.Net.WebConnection.Write (System.Net.HttpWebRequest request, System.Byte[] buffer, Int32 offset, Int32 size, System.String& err_msg) [0x00000] in <filename unknown>:0
44.   at System.Net.WebConnectionStream.WriteHeaders () [0x00000] in <filename unknown>:0
45.   at System.Net.WebConnectionStream.SetHeaders (System.Byte[] buffer) [0x00000] in <filename unknown>:0
46.   at System.Net.HttpWebRequest.SendRequestHeaders (Boolean propagate_error) [0x00000] in <filename unknown>:0
47.   at System.Net.HttpWebRequest.SetWriteStream (System.Net.WebConnectionStream stream) [0x00000] in <filename unknown>:0
48. UnityEngine.Logger:Log(LogType, Object)
49. UnityEngine.Debug:LogError(Object)
50. SynchronizerInternal.WSDownloaderHandler:Update()

 

Oh, ok.
I'll give it a try.

 

@JoshPeterson

Indeed, using 5.3.1p4 makes it disappear.
Thank you for your support.

 

Hi, I am getting this exact error when compiling to .NET 4.6 and WebGL, could you please check the unit tests about the issue # 737529 using the new compiler? I will add this also to script experimental previews feedback.

thanks!

 

Hi @JoshPeterson , thanks for your answer. I have localized the top level error in the SelectMany, this is the offending line:

Debug.Log("VMB_10");
foreach (var action in BindingActions.Values.SelectMany(x => x))
{
action();
}
Debug.Log("VMB_11");

Note: my mistake, it is not the SelectMany, I followed up the action() call and the offending line
is :

var isVisible = (bool)property.GetValue(this, null);

where "this" is a class that inherits MonoBehaviour, I have created the bug ticket (Case 930594), I will try to modify it to add this info. Btw, once the bug is fixed, how can we get it applied to our unity 2017.1? by a patch release?

I will open the bug in a mometn, and in the meantime I think I can work it around just with Selects, though it points to be the door to many other errors using LINQ I guess

cheers!

 

I'm also getting this error with after switching to Unity 2017.1 and new runtime when using https://github.com/SaladLab/Json.Net.Unity3D library. Everything was working ok using Unity 5.5 and alexzzzz C# 7.0 plugin combination. Maybe this can be workarounded with some compiler or link.xml settings?

 

Hi!

Regarding issue with a PropertyInfo.GetValue (Object, Object[]) call.

By analyzing Mono sources (https://github.com/mono/mono/blob/master/mcs/class/corlib/System.Reflection/MonoProperty.cs ) we found that probably new .Net 4.6 backend used for AOT platforms is built without FULL_AOT_RUNTIME define. This probably should be fixed.

We had issues with Unity version of JSON.Net too, and other modules (like Unity Weld, BestHTTP etc).

Also by analyzing these sources we found a workaround for this: instead of using two-parameters call to GetValue() we used 5-parameters call, because it gets invoked inside Mono anyway for AOT builds:

Replace:

Code (CSharp):

1.  
2. propertyInfo.GetValue(object, null);
3.  

With a:

Code (CSharp):

1.  
2. propertyInfo.GetValue(object, BindingFlags.Default, null, null, null);
3.  

For Newtonsoft.JSON I did this in a file (Source\Newtonsoft.Json\Utilities\ReflectionUtils.cs), then recompiled AOT versions of assemblies and put them instead of packaged versions.

 

Yep, this problem has reared it's ugly head again... @JoshPeterson is there something I can change in Json .NET for Unity to prevent the issue? I have a customer getting the issue on a mixed reality application. It's IL2CPP, with the .NET 4.6 profile. It uses both Json .NET and BestHTTP. For some reason, this only seems to crop up when people are also using networking of some kind. Unity version is 5.6.2p4

 

Just an update... I was able to fix it in Json .Net for Unity. However, now seeing this error which looks like something Unity internal. Unrelated to Json .Net but I thought I'd post it.
exception message: Attempt to access method 'Windows.Foundation.IAsyncOperation<Windows.Storage.StorageFolder>.GetResults' on type 'System.__Il2CppComObject' failed.

 

The above error was actually one I received, it comes from a BestHTTP request exception when using UWP & Il2CPP.

 

Here's what's interesting. Using my AOT friendly dll that targets .net 3.5, the issue happens on 5.6. All I changed was to build Json .Net to Target .net 4.6 instead, and a couple unrelated tweaks to make it build. If you want I can PM you with the 4.6 compiled dll if it helps your internal testing.

For what it's worth no one has reported it happening in the more popular platforms. This one happens to be uwp running on HoloLens.

 

It seems weird though that recompiling my own dll to reference 4.6 instead of 3.5 fixed it though. it was more of a last ditch effort that I didn't expect to change anything.

 

Having this issue too trying to upgrade the project to Unity 2017.1 using experimental .NET 4.6. In this case it seems to be the FullInspector-plugin which hits the issue. Do you mind writing when there's a patch release available for testing?

Thanks!

Stacktrace:

Code (CSharp):

1. Exception caught when deserializing property <skillExtraInfo> with type <Skill>
2. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ExecutionEngineException: Attempting to call method 'System.Reflection.MonoProperty::GetterAdapterFrame' for which no ahead of time (AOT) code was generated.
3.   at System.Reflection.MonoProperty+GetterAdapter.Invoke (System.Object _this) [0x00000] in <00000000000000000000000000000000>:0
4.   at System.Reflection.MonoProperty.GetValue (System.Object obj, System.Object[] index) [0x00000] in <00000000000000000000000000000000>:0
5.   at FullSerializer.Internal.fsMetaProperty.Read (System.Object context) [0x00000] in <00000000000000000000000000000000>:0
6.   at FullSerializer.Internal.fsReflectedConverter.TryDeserialize (FullSerializer.fsData data, System.Object& instance, System.Type storageType) [0x00000] in <00000000000000000000000000000000>:0